Supernatural - Possession Effect

Does anyone know how to reverse a particular effect?
I took a smoke effect from the Effects Builder, but instead of the smoke rising, I want it to get "sucked up" if you understand, how is that possible? I need it for a kind of possession effect like in Supernatural

I don't know if you can motion track somefthing like that. Doing it by hand would be pretty easy, though. The tricky part would be animating a mask around the mouth to make it look like the subject's inhaling it. And Mesh Warp might be useful, too.